<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=<device-width>, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="test1"></div>
    <div id="test2"></div>
    <input type="text" value="">

    <script src="jquery-3.7.1.min.js"></script>
    <script>
        $(document).ready(function() {
            $("#test1").html("hello");
            $("#test2").text("world");
            $("input").val("hahaha");
        })
    </script>
</body>
</html>